Ive got a 97 1500 ext.cab shortbed 2wd. with the 350 vortec mods include volant cool air intake,throttlebody spacer,hedman shorty hedders,borla exhaust,march pulleys,msd 6a ignition,msd blaster coil,B&M shift kit and a hypertech ptm.Ive got 3.42 gears with posi so it hooks up pretty good.What do yall think I will run in the 1/4 mile this weekend?It dynoed at 224rwhp and 307rwtq.

 

Mid 15's... that's just a shot in the dark. Your motor while having more displacement, has less power so, that is my guess.

 

My guess would be 15.7@89mph. Good torque but low HP with 3.42 in an extended cab. I bet your 60" times will be good though. My guess would be 2.25-2.35
Anyway, good luck at the track, and welcom to the site.